It sounds like you may have the Zoom accessibility feature turned on. I suggest going into settings and make sure this feature is turned off because it sounds like you may be activating it on accident.
iOS: Configuring accessibility features
- Use three fingers and double-tap the screen to enable Zoom. If you need to increase the level of Zoom, use three fingers to double-tap and hold, then move your fingers up or down on the screen to increase or decrease magnification.
Managing accessibility features using your device
Go to Settings > General > Accessibility. There are settings for the following features:
Thanks for reaching out,